Brainf*ck is arguably
the most concise programming language available given that it only has
eight commands and yet remains capable of computing any computable
problem. For more information about the language itself you can try
Cat's Eye Technologies
for a number of implementations of brainf*ck interpreters and
compilers along with a number of sample scripts.

BrainScript is an
Active Script implementation of Brainf*ck.
The Active Script
technology is a mechanism built upon COM which
defines a set of interfaces that allow different script languages to
be hosted by an active scripting aware application. A good example is
Internet Explorer. You can write script elements in your html pages
using any installed active scripting engine by specifying the language
attribute. Hence, there are now such engines for Perl, Python, Ruby
and others. Now we may add Brainf*ck to this illustrious list. "Why?"
I hear you ask - because we can!

It turns out that brainf*ck isn't especially useful as an active
script languge because there is no mechanism to manipulate the object
model exposed by a hosting application. For instance, to produce
output on an internet explorer page, the language interpreter is given
a document object to manipulate. I have yet to work out a
method to call methods on such objects, or even how to represent such
an object in the brainf*ck interpreter. However, all is not lost. Your
script will be interpreted and the resulting buffer is returned as a
string. unfortunately this still doesn't help you unless you are using
a custom client but no matter - the program has been evaluated and the
answer computed. What more can you ask?

As an example, here is a valid Windows Script Host script, using
the BF HelloWorld example code